Lining for ball mills



July 3, 1923.

E. HEDBURG LINING FOR BALL MILLS Filed April 5, 1920 3 Sheets-Sheet 1 E. HEDBURG LINING FOR BALL MILLS July 3, 1923.

Filed April 5,

1920 3 Sheets-Sheet 2 5140mm 'EricHecllrulg,

3M I flaw/" July 3, 1923. 1,460,796

' E. HEDBURG LINING FOR BALL MILLS Filed April 5, 1920 '3 Sheets -Sheet 5 31mm toz ErtcHedlrur g,

Patented July 3, 1923.

A UNITED [STATES ERICI HEDBURG, or KinGMAinAnIzoNA.

LINING r03 Application filed; April 5,

To (LZZ whom it many concern:

Be it known that I Enro HEDBURG, a citizen ofthe United States, residing at Kingman, in the county of Mohave and State. of Arizona, have inventedv certain new and useful Improvements in Liningsfor Ball Mills, of which the following is a specification.

object to provide a lining for a mill which discharges the material at the center thereof. In both forms of the invention the lining is made in sections or segments of a circle whereby new and unused sections may be placed in the mill as the original sections become worn and hence the material which is passed through the mill is ground or disintegrated to auniform degree. In both forms of the invention the llning sect ons 7 are provided with grooves in which the balls are adapted to travel and with which the balls cooperate during the grinding opera tion.

In the preferred form of the invention the lining sections are mounted upon feet whereby the body portions of the sections are spaced from the inner surface of the drum or body of the mill. These sections are further provided with'transversely disposed slots or recesses through which the ground material may pass thus separating the same promptly from the coarser material. In this form of the invention the discharge end of the mill is provided with gate controlled apertures through which the ground material may pass from the drum or body of the mill.

In the accompanying drawings Figure l is a longitudinal sectional view of the preferred form of the ball mill.

Figure 2 is a transverse sectional View of the same.

Figure 3 is a perspective view of one of the sections of the lining.

Figure 4: is a longitudinal sectional view of a modified form of the mill.

Figure 5 is a perspective view of a lining BALL MILLS. 1920. SeriaI N0. 371,291. section which is used in the modified form of the mill. .1

As illustrated in Figures was sat.

the drawings the ball mill comprises a body or, ;d'rum 1 of the usual cylindrical form. Thls bodyis suitably supported and, journalledfor rotation, there being ia gearwheel 2 and teeth 3 provided forrotating the drum I'I1.;l. .usual manner., The material to be ground is introduced into the drum through the central inlet opening 4. The drum 1 is provided at its discharge end and at its peripheral portion with apertures5 and adjustable gates. 6 are located at the same end of the drum and maybe moved over the apertures to regulate the quantity or flow ofthe material through the apertures.

A renewable lining is provided for the drum of the mill and the said lining consists of sections 7 in the form of segments of a circle and these sections are'arranged within the drum insets which are placed end to end andthe joints between the ends of one set of the sections are in staggered relation to the joints between the ends ofthe adjacent sets of sections as best illustrated in Figure 1 of the drawings.

The lining sections are provided at their inner sides with grooves 8 whichextend lon-v gitudinally of the sections and the said sections are provided at their outer sides with feet 9 which are adapted torest against the inner surface of the body of the drum whereby the body portion of the lining sections arespaced from the inner surface of .the drum. The grooves 8 are adapted to receivethe balls 10 of'the mill. The sections 7 are'further provided with slots 11 which are located at points between the grooves 8 and slots 12 which are located at the side edges of the sections.

When the material tobe ground is fed into the drum 1 through the inlet opening land the drum is rotated the balls 10 roll upon the material and break or disintegrate the same. 7 through the slots 11 and 12 and enters the space between the outer surfaces of the lining sections and the inner surface of the.

This finer material gravitatesmoved and new sections inserted in the drum and substituted in their stead. Therefore the degree to which the materialis ground or reduced may be maintained uniform;

In the form of the invention as shown in Figures 4; and 5the drum 1 is provided with a central discharge outlet 18 and the apertures 5 as shown and described in connection with the form illustrated in Figure 1 are eliminated. In theumodi fied form the lining sections 14: are in the form of segments of a circle and they fit snugly against the inner surface of the body of the drum '1.

- These sections are provided with grooves 15 to sink in these particles, the particles are forced upwardlyand passout of the drum through the saiddischarge outlet.

In both forms of theinvention a segmental lining section is employed and these sections are provided with grooves for the reception of the grinding balls of the mill.

Having described the invention what is claimed is Ina mill lining a section in the form of a segment of a circle and having grooves at its inner side and'feet at its outer side and having slots passing transversely through the same, some of the slots being located between the grooves and other of the slots being located at theside edge portions of the segment.

In testimony whereof I afliX my signature.

ERIC HEDBURG. 

